| 摘要 |
PURPOSE:To attain ease of manufacture, by combining a coaxial resonator resonated in a mode of higher order and a coaxial resonator resonated at the fundamental mode, changing the dielectric constant of a dielectric substance packed in the coaxial resonators and making the length of each coaxial resonator equal. CONSTITUTION:Trimmer capacitors 2 and 2' for resonance frequency adjustment are connected in parallel with coaxial resonators 1 and 1' terminated for the tips with short-circuiting. Taking the specific dielectric constant of dielectric substances 15, 15' packed to the coaxial resonators 1 and 1' as about 80, the characteristic impedance as 7OMEGA, the length as about 9mm.. When the capacitors of the trimmer capacitors 2 and 2' is varied around 2PF, the coaxial resonators are in resonance at the fundamental mode in about 800-900MHz. On the other hand, a coaxial resonator 10 is resonated to the fundamental mode in about 2.5GHz, the specific dielectric constant of a dielectric substance 16 packed at the inside is about 6 and the length is almost the same length of the coaxial resonator 1. |
